We've had a great stay at Khun May's place for our weekend getaway.
Location was great; it's in the heart of Bangkok / Sukhumvit area, so you can get to other places easily. It's close to Phrom Phong BTS station so you can save a lot getting around Bangkok.
The place was great as well; it's very, very spacious and basic amenities are provided (including towels, shampoo, body wash, and kitchen amenities). Rooms are clean and spacious.
Khun May has been very responsive and detailed with the instructions even before check-in so there's no room for any confusion. There was a slight issue with WIFI but that was resolved very quickly.
Highly recommended!